Design and Realization of the Doughnut-shaped Karnaugh Map Spatial Structure

This paper innovatively proposes a Doughnut-shaped Karnaugh Map spatial structure, which can intuitively show the principle of adjacency between the minimum items in combinational logic circuit. Firstly, we analyze the difficulties in the process of combinational logic circuit design, and analyze the Karnaugh map method used in logic function simplification. Then, we analyze the steps of Karnaugh map reduction in detail, and define and analyze the concepts of minimum term and Karnaugh circle. Then, we propose this kind of donut Karnaugh map structure, which can clearly show the adjacency of the edge of planar Karnaugh map. Finally, we verify the important role of this method in the process of circuit design through the design experiment of combined logic circuit of referee voting device.